Dar Gali, Yehiel Alon, Cale' Benzoor Maya
a Faculty of Social Welfare & Health Studies, Department of Physical Therapy , University of Haifa , Haifa , Israel.
b Physical Therapy Clinic, The Ribstein Center for Sport Medicine Sciences and Research , Wingate Institute , Netanya , Israel.
Sports Biomech. 2019 Aug;18(4):426-436. doi: 10.1080/14763141.2017.1412495. Epub 2018 Jan 21.
The landing error scoring system (LESS) assesses the quality of a landing after a jump. The quality of the jump is usually evaluated using a three-dimensional (3-D) motion analysis system or a two-dimensional (2-D) video analysis visually rated by a clinician. However, both methods have disadvantages. The aim of this study was to examine the concurrent validity of a novel portable motion analysis system ('PhysiMax System') in assessing the LESS score by comparing it to video analysis. The study population included 48 healthy participants (28.45 ± 5.61 years), each performing the LESS test while two video cameras and the 'PhysiMax' simultaneously recorded the jump. The 'Physimax' system automatically evaluated the LESS. Subsequently, the examiners scored the test by viewing the video recordings, blinded to the 'PhysiMax' results. The mean LESS score, using the video recordings and the 'PhysiMax' was 4.77 (±2.29) and 5.15 (±2.58), respectively, (ICC = 0.80, 95% confidence intervals 0.65-0.87), mean absolute differences 1.13 (95% confidence intervals; 0.79-1.46). The results indicate a high consensus between the methods of measurement. The 'Physimax' system's main advantages are portability, objective evaluation and immediate availability of results. The system can be used by athletic trainers and physiotherapists in the clinic and in the field for jumping assessment.
落地误差评分系统（LESS）用于评估跳跃后落地的质量。通常使用三维（3-D）运动分析系统或由临床医生进行视觉评分的二维（2-D）视频分析来评估跳跃质量。然而，这两种方法都有缺点。本研究的目的是通过将一种新型便携式运动分析系统（“PhysiMax系统”）与视频分析进行比较，来检验其在评估LESS评分方面的同时效度。研究人群包括48名健康参与者（28.45±5.61岁），每人进行LESS测试，同时两台摄像机和“PhysiMax”记录跳跃过程。“Physimax”系统自动评估LESS。随后，检查人员在不知道“PhysiMax”结果的情况下，通过观看视频记录对测试进行评分。使用视频记录和“PhysiMax”得出的LESS评分均值分别为4.77（±2.29）和5.15（±2.58），（组内相关系数=0.80，95%置信区间0.65 - 0.87），平均绝对差为1.13（95%置信区间；0.79 - 1.46）。结果表明测量方法之间具有高度一致性。“Physimax”系统的主要优点是便携性、客观评估以及结果即时可得。该系统可供运动训练师和物理治疗师在诊所和现场用于跳跃评估。
